although it's fair to ask as the mayor of newark, doesn't he already know? the snap challenge means eating on just $4.32 a day. he says he's doing it to, quote, raise awareness and understanding of food insecurity, reduce the stigma of s.n.a.t. participation, and amplify compassion for individuals and communities in need of assistance. the democratic mayor seems to be itching to prove them wrong. i'm not saying booker is insincere. i'm just wondering what living for just a week in someone else's shoes really proves. it's not like the food stamp challenge hasn't been done before. the mayors of philadelphia and phoenix, even super chef mario batali have done it. what will it tell us that we don't already know. the talk back question today, is cory booker's food stamp challenge helpful or a pointless exercise? your responses later this hour. >>> just 28 days remain for president obama and congress to work out a high stakes deal to avoid that fiscal cliff. can they do it, will they do it. our political panel tackles that next. and with photo stream, you can shar